I'm so glad you are finally getting a fresh set of eyes on your engine. I know he's your friend but man you have had some issues for the ET's you are going. Good luck and I too hope it's a simple issue

1970 Duster
Edelbrock headed 408
5.984@112.52
422 Indy headed small block
5.982@112.56 mph
9.42@138.27

Livin and lovin life one day at a time